Uncheck other checkbox if check one check box -on modifiedField table method

Hey! How should I write the code on the modifiedField method on the table so that a check box is unchecked when another is checked?

When I check a checkbox in the DefaultValue field, the others must be unchecked. In the end, I must be able to have only one checked value per column. 

The name of the field is DefaultValue (checkbox) and it is an Enum of type NoYes and the table is PI_MarketingCategory